{-# LANGUAGE TemplateHaskell #-}
module CalamityCommands.ParsePrefix
( ParsePrefix(..)
, parsePrefix
, useConstantPrefix ) where
import qualified Data.Text.Lazy as L
import qualified Polysemy as P
data ParsePrefix msg m a where
ParsePrefix :: msg -> ParsePrefix msg m (Maybe (L.Text, L.Text))
P.makeSem ''ParsePrefix
useConstantPrefix :: L.Text -> P.Sem (ParsePrefix L.Text ': r) a -> P.Sem r a
useConstantPrefix :: Text -> Sem (ParsePrefix Text : r) a -> Sem r a
useConstantPrefix Text
pre = (forall (rInitial :: EffectRow) x.
ParsePrefix Text (Sem rInitial) x -> Sem r x)
-> Sem (ParsePrefix Text : r) a -> Sem r a
forall (e :: (* -> *) -> * -> *) (r :: EffectRow) a.
FirstOrder e "interpret" =>
(forall (rInitial :: EffectRow) x. e (Sem rInitial) x -> Sem r x)
-> Sem (e : r) a -> Sem r a
P.interpret (\case
ParsePrefix msg -> Maybe (Text, Text) -> Sem r (Maybe (Text, Text))
forall (f :: * -> *) a. Applicative f => a -> f a
pure ((Text
pre, ) (Text -> (Text, Text)) -> Maybe Text -> Maybe (Text, Text)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Text -> Text -> Maybe Text
L.stripPrefix Text
pre Text
msg))